[mythtvnz] Better data for US sourced content

[Robert Kulagowski]

I have been making the AUNZ Schedules Direct data better by replacing
the "EPNZ" and "EPAU" (internally generated programs based on the feed
I get) with the "true" EP and MV for movies and episodes.

I been updating Late Show with Stephen Colbert and all of the movies
that I have access to.

If there is a US program that you care about that still has the "EPNZ"
format, please let me know via a ticket to the Schedules Direct
website so that I can start converting.